21714631 has 4 divisors (see below), whose sum is σ = 21735592. Its totient is φ = 21693672.

The previous prime is 21714617. The next prime is 21714703. The reversal of 21714631 is 13641712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21714631 - 2⁷ = 21714503 is a prime.

It is a super-2 number, since 2×21714631² = 943050398932322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21714596 and 21714605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21714031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8841 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (5433898).

Almost surely, 2^21714631 is an apocalyptic number.

21714631 is a deficient number, since it is larger than the sum of its proper divisors (20961).

21714631 is a wasteful number, since it uses less digits than its factorization.

21714631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20960.

The product of its digits is 1008, while the sum is 25.

The square root of 21714631 is about 4659.8960288830. The cubic root of 21714631 is about 278.9871184471.

The spelling of 21714631 in words is "twenty-one million, seven hundred fourteen thousand, six hundred thirty-one".